The only way to do it involves turning the car off first, then pressing 'Power' with your foot off the brake pedal. Pressing once goes into accessory, a second time goes into 'IG-ON' (the same as 'on' on a normal car, all functions are available, except the engine isn't running. In this case, the HV battery is still disconnected,) a third time goes back off. At any setting, holding down the brake pedal and hitting 'Power' turns the car all the way on ('READY' mode.)mr.whit said:Does anyone know how to put the prius in the accessory mode after moving the car and the car has been running. so you can listen to radio or roll down the windows with turning the car off, but turning the engine off.